This is the 6203rd most frequent Korean word.
스스로를
"스스로를" means "oneself" or "self" (as the object of a sentence).
In this sentence, '스스로를' refers to 'oneself' and functions as the object of the verb '믿지'(do not believe).
스스로를 믿지 않는다면 성공하기 어렵습니다.
If you do not believe in yourself, it is hard to succeed.
Here, '스스로를' indicates 'himself,' serving as the direct object of the verb '돌아보며'(reflects).
그는 매일 스스로를 돌아보며 반성합니다.
He reflects on himself and regrets every day.
In this example, '스스로를' signifies 'ourselves,' acting as the object of the verb '사랑하지'(do not love).